膛线 (táng xiàn) — rifling (the spiral grooves inside a gun barrel that spin a bullet)

Definition

Examples

• 这种枪的膛线设计非常精密。
  Zhè zhǒng qiāng de táng xiàn shè jì fēi cháng jīng mì.
  The rifling design of this type of gun is very precise.
• 制造膛线需要高精度的机床。
  Zhì zào táng xiàn xū yào gāo jīng dù de jī chuáng.
  Manufacturing rifling requires high-precision machine tools.
• 由于膛线磨损，子弹的精度下降了。
  Yóu yú táng xiàn mó sǔn, zǐ dàn de jīng dù xià jiàng le.
  Due to wear of the rifling, the bullet's accuracy decreased.